JEE MATHEMATICS MCQ: SYSTEM OF CIRCLES

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Application +4 | -1

The length of the common chord of two circles of radii 15 and 20, whose centres are 25 units apart, is

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Correct option: A

Option A (24) is correct because the circles intersect orthogonally, and the length of the common chord can be calculated using the formula

\frac{2rR}{\sqrt{r^2+R^2}}

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